Impact of land use changes on catchment soil erosion and sediment yield in the northeastern China: A panel data model application  

作　　者：Haiyan Fang 

机构地区：[1]Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China [2]College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《International Journal of Sediment Research》2020年第5期540-549,共10页国际泥沙研究（英文版）

基　　金：This work was financially supported by projects of the National Natural Science Foundation of China(Grant Numbers 41977066 and 41571271).

摘　　要：Land use is an important factor influencing soil erosion and sediment yield(SESY).Regressing soil erosion intensity(SEI)and sediment yield(SY)to land use characteristics can provide necessary information for controlling soil loss.However,current simple regression methods emphasize cross sectional parameters,with less emphasis on temporal variability of relevant land use parameters so that the derived effects of land use change on SESY can be biased.Here,a panel data method was applied to quantify the impact of land use change on SESY in 1954,1975,and 2015,based on the WaTEM/SEDEM model and seven landscape metrics for 25 reservoir catchments in northeastern China.The results indicate that SEI and area-specific SY(SSY)continuously decreased from 1954 to 2015,which were significantly correlated with landscape metrics such as area-edge metrics of mean patch area(AREA_MN),shape index of the mean related circumscribing circle(CIRCLE_MN),aggregation index of effective mesh size(MESH),patch cohesion index(COHESION),and diversity metrics such as Shannon's diversity index(SHDI),patch richness density(PRD),and modified Simpson's evenness index(MSIEI).The results suggested that catchment SESY can be reduced through decreasing mean patch area,patch mesh size,and physical connectivity of patches,enriching landscape types,and elongating land use patches.These findings are helpful to effectively implement soil conservation measures in northeastern China and similar regions worldwide.The current study also implies that the panel data approach will have beneficial potential applications in earth-science research fields.

关 键 词：WaTEM/SEDEM Soil erosion Sediment yield Landscape metrics Panel data model 

分 类 号：S157.1[农业科学—土壤学]